The Mullard EL32 is an octal based audio output pentode. The EL2 is electrically identical but mounted on the Ct8 side contact base that was popular in Europe but regarded as having poor reliability in the UK.
Mullard say of this valve that it is a 200 mA heater valve for use in AC/DC sets or for use in car radios. The values given are for single ended use, in push pull a pair can deliver 7 W.
The clear glass envelope offers a clear view inside. The control grid has heat radiating fins at the top of the supports, but it is the screen grid that is wound on copper supports. The oxide coating on the cathode tube can be seen just above the top of the anode.
The anode is folded to give four side wings for additional surface area for heat loss.
The classic envelope is 34 mm in diameter and, excluding the IO base pins, is 94 mm tall.
References: Datasheet & 1043. Type EL32 was first introduced in 1940.